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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bef6238523d8cca59517a9fa5f537fefb5f9c64891dbcb3f13d8f3d899c942e' 
  AND token = '1J2VcbvwmslxhbdlOpIRl535S1F/SW+Hy30z8AW27W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}