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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b01a13d8a0e2a1f66928d2942713f57713048725f56ae983f3f5ea254550e45e' 
  AND token = 'uycW7F+Sl0vQviDA13h/JpZf+UR/a5sST+KJT3/ge0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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