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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f2c3066929a16882e2dd4ef950e419b9ba8f8313403c24290b84e2d77174dd1' 
  AND token = 'A4w/mf0umOyhSx1PmR62PWDeLlylIi4awrp9mDmDzr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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