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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f0a522066e2992ba0644097b509c4d7e014fcb138725a6bdba3ceedaa093a85' 
  AND token = 'g0fm69r5Gm2L2AcAJsmg2jLiGj+QskFKrZolBec3x/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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