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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3950569b0e60719604676f1125a7e990657d1712ffd8375e8013ed660f722055' 
  AND token = 'eG2eCCv+Pp4/BypbJIGf2JRAfBcbxZGX4b99aBIN5bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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