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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '017af8916baad4916f7426a62c6fbb99904544353d3272a4e0dd4664f9907612' 
  AND token = 'pFc1IK1Nfaz/dbhXeoqFGRCrbUb8pREBwhXjuHXDILs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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