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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c410d0297e6e68580e41b9c9ac38afc45539f9a4f9c20c4ea0385fab4577ab76' 
  AND token = 'qZnobFX8nL3Hs+XezCthF2/H3YjLvCatxpAa9TnrCIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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