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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b58dcbba87191593e74dba8a695e27e5d4555fed1d2212a3cc2b5a5f7e86378e' 
  AND token = '6v1+oD3z3ffPfl9g8v6plRUk6PlIEP2sqD6dvxKmrOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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